linux_dsm_epyc7002/arch/x86/kernel/process.h
Thomas Gleixner 5635d99953 x86/speculation: Avoid __switch_to_xtra() calls
The TIF_SPEC_IB bit does not need to be evaluated in the decision to invoke
__switch_to_xtra() when:

 - CONFIG_SMP is disabled

 - The conditional STIPB mode is disabled

The TIF_SPEC_IB bit still controls IBPB in both cases so the TIF work mask
checks might invoke __switch_to_xtra() for nothing if TIF_SPEC_IB is the
only set bit in the work masks.

Optimize it out by masking the bit at compile time for CONFIG_SMP=n and at
run time when the static key controlling the conditional STIBP mode is
disabled.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Casey Schaufler <casey.schaufler@intel.com>
Cc: Asit Mallick <asit.k.mallick@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Jon Masters <jcm@redhat.com>
Cc: Waiman Long <longman9394@gmail.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Dave Stewart <david.c.stewart@intel.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20181125185005.374062201@linutronix.de
2018-11-28 11:57:11 +01:00

40 lines
1.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
//
// Code shared between 32 and 64 bit
#include <asm/spec-ctrl.h>
void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p);
/*
* This needs to be inline to optimize for the common case where no extra
* work needs to be done.
*/
static inline void switch_to_extra(struct task_struct *prev,
struct task_struct *next)
{
unsigned long next_tif = task_thread_info(next)->flags;
unsigned long prev_tif = task_thread_info(prev)->flags;
if (IS_ENABLED(CONFIG_SMP)) {
/*
* Avoid __switch_to_xtra() invocation when conditional
* STIPB is disabled and the only different bit is
* TIF_SPEC_IB. For CONFIG_SMP=n TIF_SPEC_IB is not
* in the TIF_WORK_CTXSW masks.
*/
if (!static_branch_likely(&switch_to_cond_stibp)) {
prev_tif &= ~_TIF_SPEC_IB;
next_tif &= ~_TIF_SPEC_IB;
}
}
/*
* __switch_to_xtra() handles debug registers, i/o bitmaps,
* speculation mitigations etc.
*/
if (unlikely(next_tif & _TIF_WORK_CTXSW_NEXT ||
prev_tif & _TIF_WORK_CTXSW_PREV))
__switch_to_xtra(prev, next);
}